speedometer jumps
i have replaced the speed sensor and the wire up to the fire wall. what would make it jump around.
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Maybe a bad ground? IDK just a guess.
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Perhaps the tone ring on the carrier is damaged or has come off the shoulder upon which it is supposed to sit?
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On an '81, the speed sensor wiring has nothing to do with the speedo, and the sensor itself is just a mechanical link from one section of the cable to the other. If the speedo is jumping, either the speedo head is bad, or the cable needs to be cleaned & lubed, or replaced.
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:o
Doh! I didn't notice the model year |
Doh! I didn't notice the model year |
My truck is a 95 and I have checked the rear ring
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And only jumps around 60
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I had a 91 and my speedo started to jump a little at first then alot and it ended up being a short some where, never found out where, and had to have the whole speedo replaced
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I don't see how a short would do ANYTHING to this type of speedometer. There's NO, again NO electronics involved. Well, the light bulbs are pretty close, still do nothing. There is a cable (mechanical cable, not electric cable) that has a square shaped end that fits into the back of the speedometer. When the speedometer is out you can even turn it by hand and the needle will move. Where's the electronics in that? Nowhere. The cable that I mentioned goes from the speedometer to the transmission, it goes into the transmission, where it's turned by a gear. No electronics.
Since there are literally only 3 things invloved, the speedometer, the cable, and the gear, repair shouldn't be all that bad. Checking the gear is relatively easy, and cleaning the cable is somewhat easy too. When\If you need to get a new speedometer, make sure the donor truck's drivetrain matches yours. I upgraded mine from a 5.8l (mine is a 5.0) and the speedometer is off a little, my guess is the donor truck had different gears than my truck. |
Originally Posted by booba5185
(Post 4412760)
I don't see how a short would do ANYTHING to this type of speedometer. There's NO, again NO electronics involved. Well, the light bulbs are pretty close, still do nothing. There is a cable (mechanical cable, not electric cable) that has a square shaped end that fits into the back of the speedometer. When the speedometer is out you can even turn it by hand and the needle will move. Where's the electronics in that? Nowhere. The cable that I mentioned goes from the speedometer to the transmission, it goes into the transmission, where it's turned by a gear. No electronics.
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Originally Posted by booba5185
(Post 4412760)
Since there are literally only 3 things invloved, the speedometer, the cable, and the gear, repair shouldn't be all that bad. Checking the gear is relatively easy, and cleaning the cable is somewhat easy too. When\If you need to get a new speedometer, make sure the donor truck's drivetrain matches yours. I upgraded mine from a 5.8l (mine is a 5.0) and the speedometer is off a little, my guess is the donor truck had different gears than my truck. |
Yea, I know I can get another gear, but I plan\hope to get bigger tires soon, so I'd end up switching it back anyways. My bad, I didn't see the post about it being a 95, I went off his name so I thought it was an 81.
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So did Steve, but look at post #7..........
Need to read the whole thread before you jump in that forcefully! |
Originally Posted by fastford1981
(Post 4411779)
My truck is a 95...
Then read this whole caption & the links in it: https://www.supermotors.net/getfile/...ster-front.jpg
Originally Posted by glc
(Post 4413474)
So did Steve...
Originally Posted by KUhawkr38
(Post 4412477)
I had a 91 and my speedo started to jump ... and it ended up being a short some where...
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